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Seasonal and spatial distribution of particulate organic matter (POM) in the Chukchi and Beaufort Seas

Seasonal and spatial distribution of particulate organic matter (POM) in the Chukchi and Beaufort Seas
Seasonal and spatial distribution of particulate organic matter (POM) in the Chukchi and Beaufort Seas
As part of the Western Arctic Shelf–Basin Interactions (SBI) project, the production and fate of organic carbon and nitrogen from the Chukchi and Beaufort Sea shelves were investigated during spring (5 May–15 June) and summer (15 July–25 August) cruises in 2002. Seasonal observations of suspended particulate organic carbon (POC) and nitrogen (PON) and large-particle (>53 ?m) size class suggest that there was a large accumulation of carbon (C) and nitrogen (N) between spring and summer in the surface mixed layer due to high phytoplankton productivity. Considerable organic matter appeared to be transported from the shelf into the Arctic Ocean basin in an elevated POC and PON layer at the top of the upper halocline. Seasonal changes in the molar carbon:nitrogen (C:N) ratio of the suspended particulate organic matter (POM) pool reflect a change in the quality of the organic material that was present and presumably being exported to the sediment and to Arctic Ocean waters adjacent to the Chukchi and Beaufort Sea shelves. In spring, low particulate C:N ratios (<6; i.e., N rich) were observed in nitrate-replete surface waters. By the summer, localized high particulate C:N ratios (>9; i.e., N-poor) were observed in nitrate-depleted surface waters. Low POC and inorganic nutrient concentrations observed in the surface layer suggest that rates of primary, new and export production are low in the Canada Basin region of the Arctic Ocean.
Ocean carbon cycle, Particulate matter, C:N stoichiometry, Chukchi Sea, Arctic Ocean
0967-0645
3324-3343
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Hansell, Dennis A.
d4f0a3af-ca20-4791-a794-e52cbd56d654
Moran, S. Bradley
af2c953a-031c-415c-b057-0119e27b4949
Codispoti, Louis A.
b581ef3c-99b2-48ed-9697-82390e40aa1c
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Hansell, Dennis A.
d4f0a3af-ca20-4791-a794-e52cbd56d654
Moran, S. Bradley
af2c953a-031c-415c-b057-0119e27b4949
Codispoti, Louis A.
b581ef3c-99b2-48ed-9697-82390e40aa1c

Bates, Nicholas R., Hansell, Dennis A., Moran, S. Bradley and Codispoti, Louis A. (2005) Seasonal and spatial distribution of particulate organic matter (POM) in the Chukchi and Beaufort Seas. Deep Sea Research Part II: Topical Studies in Oceanography, 52 (24-26), 3324-3343.

Record type: Article

Abstract

As part of the Western Arctic Shelf–Basin Interactions (SBI) project, the production and fate of organic carbon and nitrogen from the Chukchi and Beaufort Sea shelves were investigated during spring (5 May–15 June) and summer (15 July–25 August) cruises in 2002. Seasonal observations of suspended particulate organic carbon (POC) and nitrogen (PON) and large-particle (>53 ?m) size class suggest that there was a large accumulation of carbon (C) and nitrogen (N) between spring and summer in the surface mixed layer due to high phytoplankton productivity. Considerable organic matter appeared to be transported from the shelf into the Arctic Ocean basin in an elevated POC and PON layer at the top of the upper halocline. Seasonal changes in the molar carbon:nitrogen (C:N) ratio of the suspended particulate organic matter (POM) pool reflect a change in the quality of the organic material that was present and presumably being exported to the sediment and to Arctic Ocean waters adjacent to the Chukchi and Beaufort Sea shelves. In spring, low particulate C:N ratios (<6; i.e., N rich) were observed in nitrate-replete surface waters. By the summer, localized high particulate C:N ratios (>9; i.e., N-poor) were observed in nitrate-depleted surface waters. Low POC and inorganic nutrient concentrations observed in the surface layer suggest that rates of primary, new and export production are low in the Canada Basin region of the Arctic Ocean.

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More information

Published date: December 2005
Keywords: Ocean carbon cycle, Particulate matter, C:N stoichiometry, Chukchi Sea, Arctic Ocean
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 358277
URI: https://eprints.soton.ac.uk/id/eprint/358277
ISSN: 0967-0645
PURE UUID: 30786bc1-4398-4c5d-b2e3-ce0f353c7629

Catalogue record

Date deposited: 02 Oct 2013 16:03
Last modified: 05 Oct 2017 06:41

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Contributors

Author: Dennis A. Hansell
Author: S. Bradley Moran
Author: Louis A. Codispoti

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